Urochloa polyphylla

Urochloa polyphylla (R. Br.) R.D.
Webster. Bull. Misc. Inform. 315 (1923).

(GPWG 2001) : Subfamily Panicoideae. Paniceae.

Basionym and/or
Replacement Name:
 Panicum polyphyllum
R. Br., Prodr. 190 (1810).

Type of Basionym or
Protologue Information
: "(T.) Littora Novae Hollandiae intra

Recent synonyms:
Brachiaria polyphylla.

Key references
(books and floras):
[1810]. R.Brown, Prodromus (190 as Panicum
), [1878] G.Bentham, Flora Australiensis 7 (477 as Panicum
), [2002] D.Sharp & B.K.Simon, AusGrass, Grasses of Australia
(as Brachiaria).

Habit. Annual.
Rhizomes absent. Stolons absent or present. Culms geniculately ascending, 15–60
cm tall, 3–7 -noded. Mid-culm internodes pubescent. Mid-culm nodes pubescent.
Leaf-sheaths glabrous on surface or hairy. Ligule a fringe of hairs, 0.3–0.6 mm
long. Leaf-blades linear or lanceolate, 2–8 cm long, 3–7 mm wide. Leaf-blade
surface indumented.

Inflorescence compound, a panicle of racemes. Racemes 3–7, 1.5–4 cm long, 1.5–2
mm wide. Central inflorescence axis 3–15 cm long.

Spikelets pedicelled. Fertile spikelets 2-flowered, the lower floret barren
(rarely male), the upper fertile, comprising 1 basal sterile florets,
comprising 1 fertile floret(s), without rachilla extension, elliptic, dorsally
compressed, 2.9–3.7 mm long. Rhachilla internodes brief up to lowest fertile

Glumes dissimilar, thinner than fertile lemma. Lower glume ovate, membranous,
without keels, 5–7 -nerved. Lower glume surface glabrous. Upper glume elliptic,
2.8–3.5 mm long, membranous, without keels, 5–9 -nerved. Upper glume surface
glabrous. Upper glume apex mucronate. Florets. Basal sterile florets 1,
barren, with palea or without significant palea. Lemma of lower sterile floret
100 % of length of spikelet, membranous, 5 -nerved.

Fertile lemma 2.4–2.8
mm long, without keel. Lemma apex mucronate. Palea without keels. Anthers 3.

: Australasia.

: Western Australia, Northern Territory, Queensland.

Northern Territory: Darwin &
Gulf. Queensland:
Cook, North Kennedy.

The red to brown glabrous spikelets and narrow primary branches are diagnostic
for this easily recognizable Australian endemic.

In tropical and
subtropical rain forests, tropical and subtropical sub-humid woodlands, and
coastal grasslands. Flowers Feb.-Aug.

AVH 2011


Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith